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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Verify my Bandsaw SFPM Calculations Please
I have one of the old Delta 14" wood bandsaws that I am using for
metal cutting. I am using a 3-phase 1HP motor with a VFD - so I can slow the motor way down for metal. To be honest, I've never used a bandsaw before, so I am learning the hard way, and I think I just huffed my first blade (14-18TPI Morse Bi-Metal). Anyway, I was just guessing at speeds to run the motor, and I thought I would calculate the SFPM to see where I really needed to be. Looking at the speeds metal bandsaws are advertised at, I think I need to slow down. Could you guys just check my math? - Bandsaw drive wheels are 14" diameter. 2 * pi * r = 44" or approx. 3.7' - Motor has 2.5" pulley, pulley on bandsaw wheel is 6" for 0.42 reduction So, if a rev of the drive wheel moves the blade 3.7' and it is driven at 0.42 of motor speed, SFPM should be (3.7)(0.42)(Motor RPM), or approx. 1.5 * Motor RPM. If that's true, getting the fastest speed of a Wilton metal bandsaw (278 SFPM), I would have to run the motor at 185 RPM! If my calcs are correct, then I need more reduction between motor and drive shaft. Does this sound right, or am I missing/misunderstanding something? Thanks, Wallace |
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